Egg shells and tooth enamel both contain calcium - the egg calcium carbonate and tooth enamel calcium phosphate.
From the linked article:
Eggshells and tooth enamel will soften and lose minerals in the presence of acid. Calcium carbonate reacts with acid to form water-soluble calcium ions and carbon dioxide. Loss of calcium makes an eggshell soft and weak. When acid is applied to tooth enamel, hydrogen ions combine with carbonate or phosphate ions in the hydroxyapatite matrix, which releases calcium ions. The demineralization of tooth enamel can create etching in the surface of the tooth.
What Are the Similarities between Eggshells and Teeth eHow
Egg is not bone
There are lots of causes of cakes issues, from something simple like over
cooking to over beating of egg whites.
Take a look at this link for a good guide to cake issues;
http://www.great-recipes.com/baking-tips/cake-baking-tips.html
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